I read in an article that birds bob their heads while walking because they eyes do not have an overlapping FOV.
I have no idea what that means.
In: Biology
Humans can perceive depth because both eyes are close enough together on the human face to overlap with each other in terms of what image is cast on the photoreceptors in each retina. The brain is able to process this information and perceive space in three dimensions, to allow you to do things like predict the trajectory of a ball as it flies through the air toward you. The overlapping field of view is what enables the brain to triangulate the positions of the same thing in the field of view and interpret depth from the angles made by visible things in each image. For any living beings that have eyes on either sides of their faces, their brains need to tell their faces to turn to put that spatial information about their surroundings together. They cannot perceive depth in the spaces around them.
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